可视化技术在机器马步行机构尺度综合系统中的应用

科学计算可视化是近年来发展起来的一门新兴技术。本文就机器马步机构尺度综合系统中可视化技术的应用作一介绍，以探讨和扩大可视化技术的应用范围。     

Body Size and Sexual Behavior in a Community-Based Sample of Women

ABSTRACT. Women's body size is closely related to their social and sexual experiences. Clinical research has found that women's lifetime sexual behaviors may vary based on body mass index (BMI). Objectives: This study examined the relationship between BMI and recent solo and partnered sexual repertoire in a community-based, non-clinical sample of women. Methods: Two hundred thirty-eight sexually active women completed an online survey measuring age, sexual relationship status, BMI, gender of sexual partners, and engagement in sexual behaviors in the previous 4 weeks. Logistic regression analyses were conducted to determine whether BMI predicted engagement in behaviors after controlling for age and sexual relationship variables. Results: Participant age ranged from 18 to 56 years (M = 30.4, SD = 7.8). Participants were predominantly in exclusive sexual relationships (62.9%, n = 146) with men (82.8%, n = 197). Mean BMI for the sample was 29.33 (SD = 9.28). Participation in self-masturbation, masturbating a partner, performing oral sex on a partner, receiving oral sex from a partner, and penile–vaginal intercourse were not predicted by BMI after controlling for age and partner variables. Conclusions: BMI did not impact sexual repertoire during the previous 4 weeks, with the exception of an increased odds ratio for penile–anal intercourse (OR = 1.06; 95% CI [1.02, 1.10]). Researchers and practitioners working with women should not assume limitations on women's sexual repertoires because of larger body size.     

非英语专业学生词汇学习策略对比研究

通过问卷调查和词汇量测试,运用定量分析的方法,分析非英语专业一、二年级学生词汇学习策略的使用特点以探讨不同年级、不同性别和不同词汇量水平的学生在策略运用上的差异以及哪些策略与词汇量水平有相关关系。结果发现有7种策略与词汇量成绩存在显著正相关,高分者和低分者在7种策略的使用上存在显著性差异。在教学过程中教师应该向学生系统的介绍词汇学习策略,以帮助学生增强词汇记忆的效果。     

缝洞型油藏离散介质网络数值试井模型

针对多重介质试井模型不符合缝洞型油藏网络状分布、非均质性极强的地质特征,建立了新的试井模型,将大尺度溶洞（流体主要的储集空间）视作零维模型,裂缝、孔洞发育的条带状地层（沟通溶洞的渗流通道）作为控制流体流动的一维模型,从而构成离散介质网络（DMN）模型。用有限差分法建立了缝洞型油藏离散介质网络油水两相数值试井模型,对渗流通道的储渗性能、大尺度溶洞的容积和距测试井的距离等因素对测试井压力响应特征的影响进行了研究。结果表明：缝洞型油藏试井压力导数曲线上类似“凹子”的特征是由大尺度溶洞向渗流网络的窜流造成的。实例分析表明,新模型解释结果与缝洞型油藏地质特征一致。     

论中国城市规模分布的区域差异

本文分析了建国以后中国三大地区的城市增长状况 ,三大地区的城市规模分布特征及其成因 ,探讨了中国中、西部地区城市规模结构的缺陷可能给对外开放和西部大开发带来的负面影响 ,同时指出了“控制大城市规模”的城市发展方针与对外开放政策、社会主义市场经济体制的建立以及西部大开发战略等的矛盾。本文认为 :大城市是地区经济发展的“增长极” ,中、西部地区缺少具有较大影响范围的大城市和特大城市 ,使得这些地区在市场经济条件下和改革开放过程中的创新机会和领先条件大为减少 ,而且会影响到西部大开发战略的顺利实施     

我国人口与经济增长稳定关系的实证分析（1953-2000）

改革开放前,我国人口数量和人口密度的增加推动了经济增长,人口与经济增长具有长期稳定关系;改革开放后,大部分地区的人口逐渐趋向于成为经济增长中的一个外生变量。在1953-2000年间,我国经济发展相对落后地区(以西藏为代表)的人口与经济增长存在长期稳定关系,人口数量和人口密度的增加对经济增长有正的效应。总体来看,在我国经济发展的较低阶段,人口与经济增长一般存在长期稳定关系,但当经济发展到较高阶段时,人口与经济增长可能不存在稳定关系。     

Family structure and and fertility behavior in Taiwan

The present analysis is based on the 1990 Taiwan Human Resources Survey to study the relationships between family structure, women's complete fertility and birth spacing. Imputed family size, as measured by either the ideal number of children expressed by a married woman or the number of actual surviving children whichever is larger, is used as a proxy of a woman's complete fertility. The results indicate a majority of married couples in Taiwan begin married life living with the husband's parents and later move out to establish a nuclear unit. This limited experience in the extended family exerts an upward pressure on imputed family size even when other relevant variables are statistically controlled. Further, the effect of living with the husband's parents on shorter duration of birth spacing is only limited to the time when the parents provide free child- care for married couples.     

家庭规模缩小对家庭经济保障能力的影响:苏南实例

本文通过实验设计方法 ,并利用苏南农村居民的数据资料 ,分析实证了在有收入积累的前提下 ,家庭规模缩小不仅不会弱化家庭保障能力 ,而且会强化家庭保障能力。不同规模家庭保障能力差别 ,随时间推移和在家庭生命周期的不同阶段具有波动性。家庭保障能力会因家庭规模的大小、消费和积累模式的差异和在家庭生命周期中的不同阶段而不同 ,并可能发生相互转换。     

A Sociodemographic Risk Index

In this paper, we conceptualize and develop an index of sociodemographic risk that we hypothesize will be an improvement over the standard poverty measure as a measure of risk for children’s development. The poverty line is widely used in government statistics and in research but is also widely acknowledged to have multiple shortcomings. Using recent data from the National Survey of America’s Families, we develop and examine a Sociodemographic Risk Index for two potential purposes: (a) to serve as a summary indicator of children’s environments that affect their well-being, and (b) to serve as a variable that can be used to identify at-risk subgroups of children whose well-being should be examined separately in indicator reports. Based on substantial research on children’s development, we chose five variables for the index: family income, family structure, parent education, family size, and home ownership. An additive sociodemographic risk index using these variables is strongly associated with multiple measures of child well-being in both bivariate and multivariate analyses. Hence, it serves as a good marker of risk for children and therefore as an indicator that could be monitored over time, across groups, and across places, as well as a variable that could be used to identify subgroups of at-risk children whose well-being should be monitored. However, analyses do not indicate that it performs better at identifying at-risk children than the current poverty measure. Therefore, we recommend the Sociodemographic Risk Index primarily as an additional summary indicator to be monitored, rather than as a replacement for the poverty measure.     

On the Asymptotic Sizes of Subset Anderson–Rubin and Lagrange Multiplier Tests in Linear Instrumental Variables Regression

We consider tests of a simple null hypothesis on a subset of the coefficients of the exogenous and endogenous regressors in a single‐equation linear instrumental variables regression model with potentially weak identification. Existing methods of subset inference (i) rely on the assumption that the parameters not under test are strongly identified, or (ii) are based on projection‐type arguments. We show that, under homoskedasticity, the subset Anderson and Rubin (1949) test that replaces unknown parameters by limited information maximum likelihood estimates has correct asymptotic size without imposing additional identification assumptions, but that the corresponding subset Lagrange multiplier test is size distorted asymptotically.